This 10W trickle charger comes with a diode which makes current flow in one direction, only from solar panel to battery. We use high quality cells for higher voltage but small AMP output from panel, as it will keep the battery in the best condition and active calcified battery cells. It comes in an anodized aluminum silver frame for optimum durability. No assembly required it comes ready to use with its provided 5m battery cable with alligator clips.